i wonder if you could tell us the advantages and disadvantages of that struggle? >> that is too hard, a wrap up moment. i found it immensely instructive and fruitful to meditate on it but in a concrete way, not sitting in my office thinking i wonder what is the difference? struggle with it, it relates to the research question. in my period, if i do early modern work, the research, when you get to the end of the research is clear because you have read everything, if you want to study the salem witchcraft trials, as a historian, if you read everything, you still don't know what the hell happened. you need to come up with an explanation. i had an interesting experience, i was writing a piece for the new yorker on the children's book stuart little. the first time i had done a piece of research in the modern period, working with people who wrote a lot, e.b. white and katharine white and i thought what was stuart little suppressed? i would love to come -- i thought it would be wide to the salem girls think they saw which is, it was a question that had an answer in the a